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Arrange the following gases in increasing order of van der Waals constant ‘a’: (A) Ar (B) CH4 (C) H2O (D) C6H6 Choose the correct option from the following.

1. D, C, B and A
2. B, C, D and A
3. C, D, B and A
4. A, B, C and D

Correct answer: A, B, C and D

Solution

The van der Waals constant 'a' reflects the strength of intermolecular forces; noble gases like Ar have weak interactions, while polar molecules like H2O have stronger forces, leading to a higher 'a' value. Thus, the order from lowest to highest 'a' is Ar, CH4, H2O, and C6H6.

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